2 * Copyright © 2009,2010 Red Hat, Inc.
3 * Copyright © 2010 Google, Inc.
5 * This is part of HarfBuzz, a text shaping library.
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
25 * Red Hat Author(s): Behdad Esfahbod
26 * Google Author(s): Behdad Esfahbod
29 #ifndef HB_OT_MAP_PRIVATE_HH
30 #define HB_OT_MAP_PRIVATE_HH
32 #include "hb-buffer-private.hh"
34 #include "hb-ot-layout.h"
39 static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS};
45 struct feature_info_t {
47 unsigned int seq; /* sequence#, used for stable sorting only */
48 unsigned int max_value;
49 bool global; /* whether the feature applies value to every glyph in the buffer */
50 unsigned int default_value; /* for non-global features, what should the unset glyphs take */
52 static int cmp (const feature_info_t *a, const feature_info_t *b)
53 { return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) : (a->seq < b->seq ? -1 : 1); }
56 struct feature_map_t {
57 hb_tag_t tag; /* should be first for our bsearch to work */
58 unsigned int index[2]; /* GSUB, GPOS */
61 hb_mask_t _1_mask; /* mask for value=1, for quick access */
63 static int cmp (const feature_map_t *a, const feature_map_t *b)
64 { return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0; }
71 static int cmp (const lookup_map_t *a, const lookup_map_t *b)
72 { return a->index < b->index ? -1 : a->index > b->index ? 1 : 0; }
75 HB_INTERNAL void add_lookups (hb_face_t *face,
76 unsigned int table_index,
77 unsigned int feature_index,
83 void add_feature (hb_tag_t tag, unsigned int value, bool global)
85 feature_info_t *info = feature_infos.push();
86 if (unlikely (!info)) return;
88 info->seq = feature_infos.len;
89 info->max_value = value;
90 info->global = global;
91 info->default_value = global ? value : 0;
94 inline void add_bool_feature (hb_tag_t tag, bool global = true)
95 { add_feature (tag, 1, global); }
97 HB_INTERNAL void compile (hb_face_t *face,
98 const hb_segment_properties_t *props);
100 inline hb_mask_t get_global_mask (void) const { return global_mask; }
102 inline hb_mask_t get_mask (hb_tag_t tag, unsigned int *shift = NULL) const {
103 const feature_map_t *map = feature_maps.bsearch (&tag);
104 if (shift) *shift = map ? map->shift : 0;
105 return map ? map->mask : 0;
108 inline hb_mask_t get_1_mask (hb_tag_t tag) const {
109 const feature_map_t *map = feature_maps.bsearch (&tag);
110 return map ? map->_1_mask : 0;
113 inline void substitute (hb_face_t *face, hb_buffer_t *buffer) const {
114 for (unsigned int i = 0; i < lookup_maps[0].len; i++)
115 hb_ot_layout_substitute_lookup (face, buffer, lookup_maps[0][i].index, lookup_maps[0][i].mask);
118 inline void position (hb_font_t *font, hb_face_t *face, hb_buffer_t *buffer) const {
119 for (unsigned int i = 0; i < lookup_maps[1].len; i++)
120 hb_ot_layout_position_lookup (font, buffer, lookup_maps[1][i].index, lookup_maps[1][i].mask);
125 hb_mask_t global_mask;
127 hb_prealloced_array_t<feature_info_t,8> feature_infos; /* used before compile() only */
128 hb_prealloced_array_t<feature_map_t, 8> feature_maps;
130 hb_prealloced_array_t<lookup_map_t, 32> lookup_maps[2]; /* GSUB/GPOS */
137 #endif /* HB_OT_MAP_PRIVATE_HH */